Jane________be very healthy because she always goes to work on a bike.

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问题 Jane________be very healthy because she always goes to work on a bike.

选项 A、must
B、would
C、need

答案A

解析 句意:简经常骑车去上班,所以她身体一定很健康。此题考查的是情态动词的用法。must表示“一定”;would意为“可能,将要”;need表示“需要”。根据句意,应该表达的是肯定的推测,故选A。情态动词表示说话人对有关行为或事物的态度和看法,认为其可能、应该或必要等。情态动词有四类:
①只作情态动词:must,Can(could),may(might),ought to;
②可作情态动词又可做实义动词:need,dare;
③可作情态动词又可作助动词:shall(should),will(would);
④具有情态动词特征:have(bad)to,used to。情态动词无人称和数的变化,情态动词后面跟的动词需用原形,否定式构成是在情态动词后面加“not”。
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